Synthesis, Characterization, Antimicrobial, DNA Cleavage and Fluorescent Activity of Metal ion(II) Coordinate with 2H-Chromene Azo novel ligand

A new ligand 2H-chromene containing azo group 2-(4-nitrophenyl)-N-(4-(phenyldiazenyl)-2H-chromen-4-amine (AH), were synthesized from the condensation reaction (1:2)of 2'-hydroxychalcone and p-aminoazobenzene. Co(II), Cu(II) and Ni(II) complexes of the new ligand have been synthesized and characterized using C.H.N. analysis,1HNMR spectra, FT.IR, UV/Visible, magnetic susceptible, conductance measuring, and fluorescence spectral spectroscopy; 13CNMR spectroscopy of the ligand was also studied. Spectroscopic results revealed the 2H-Chromene Azo (AH) ligand behaves as monodentate chelating via the nitrogen atom of amine groupat position 4 having 1:1 [M:L] ratio; suggested that the cobalt and nickel complexes have the tetrahedralstructure and a distorted tetrahedralgeometry for the copper complex, indicating their non-electrolyte nature. The new ligand shows a fluorescence emissioncomparingwith this fluorescence quenching was noticed in its metal complexes. The antibacterial potency of the free ligand and its chelates with metal ion(II) were screened against E.coli, K.pneumoniae, Staph.aureus andB.Subtilis;The DNA cleavage activity of the free ligand and its 2H-chromene azo metal (II) complexes was performedby the gel electrophoresis process, which giventhat thesecompounds are effectiveupon DNA cleavage .